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( 0 Model.)

c. F. BRIGHAM.

BRAKE SHOE.

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iini'rn STATES CHARLES F. BRIGHAM, OF WVOROESTER,

MASSACHUSETTS, ASSIGNOR OF THREE-FOURTHS TO D. AUSTIN BROIVN, TRUSTEE.

BRAKE- SHOE.

SPECIFICATION forming part of Letters Patent No. 298,283, dated May 6,

Application filed September 2!, 1883. (No model.)

To all whom it may concern:

Be it known that I, CHARLES F. BRIGHAM, of Voroester, county oflVorcester, State of l\Iassachusetts,have invented an Improvement in Carand other Brakes, of which the following description, in connection withthe accomanying drawings, is a specification, like letters on thedrawings representing like parts.

This invention has for its object the production ofan improvedbrake-shoe, composed of metal and molded fibrous material.

In the manufacture of a brake-shoe in accordance with my invention, Itake a metal frame and cover it more or less with molded fibrousmaterial composed, preferably, of asbestus in fibrous state, and oxideof magnesium tempered preferably with chloride of magnesium to renderthe same suitable to be molded into shape.

Figure 1 represents in elevation a brakeshoe embodying my inventionshaped to render it applicable as a shoe for a railway-car wheel;

and Fig. 2 is a like view of the skeleton metallic form and Fig. 3 is asection of Fig. 1 on the dotted line 00 x.

The skeleton frame A, made preferably from cast, metal, and, as hereinshown, having an eye, I), to receive ithe usual key or other appliancewhich fastens head, is made as a hollow box,within which is a series oflugsor projections, c c,'which extend from the main part or back of theframe toward what is to be the wearing-face of the shoe, and so as toconstitute a portion of the wearing-face of the same. Upon this skeletonframe A, it being placed in a suitable mold, I mold and attach thewearing surface or body B, made from a plastic compound composed offibrous material, preferably asbestus fiber and oxide of magnesium mixedand rendered plastic by the use of chloride of magnesium, I preferablyemploying about equal portions in l the shoe to the brakeweight of thesaid sium. The fiber and oxide ofmagnesiun1,hav-

ing been rendered plastio,are shaped in a mold 5- in which the skeletonframe is placed, and the body B is permitted to set or hardeni The bodyB, unlike wood, is indestructible by the action of heat arising fromfriction, and Will not cut the car-wheel as rapidly as a shoe entirelyof iron. The fibrous body B will hold as well as wood, and better thanwill a metal shoe.

I do not desire to-liinit my invention to the shape of the metal frameA, as it may be variously modified; as, for instance,I might omit thebox part or surrounding walls d d, or I might omit the lugs orprojections, and in such event the edges of the walls d d may act as apart of the wearing-face of the shoe.

If desired, I may add to the animal or vegetable fiber used an extendedor cheapening material composedof any substance commonly added toasbestus to resist heat-such as plumbago, lime, or earth but this is notessential. 65

I claim- 1. As an improved article of manufacture, a brakeshoeconsisting of a metal frame, and a contained molded body, B, composed ofasbestus hardened, substantially as described.

2. As an improved article of manufacture, a brake-shoe consisting of ametal frame, and a contained molded body, B, composed of asbestushardened, substantially as described, and mixed with an extendingheat-resisting material-such as plumbago, lime, or earthas set forth.

I I11 testimony whereof Ihave signed my name. to this specificationinthe presence oftwo subscribing Witnesses.

CHARLES F. BRIGHAM.

fiber and oxide of magne- Vitnesses:

G. W. GREGORY, B. J. NoYns.

